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Physics : Recent Questions and Answers (Page 82)

Find answers to your questions about Physics or help others by answering their Physics questions.

Literature to learn thermodynamics coming from a statistical physics background

I would like to read a book which rigorously defines what in applied thermodynamics is called "heat" and gives a proper derivation of the laws of thermodynamics from quantum statistics...

Asked on 08/30/2021

1 answer

Flow of charges

I saw this question which asks for the condition for flow of electricity through the conductor i know that electricity will flow only when there is a potential difference achieved...

Asked on 08/30/2021

3 answer

What is the definition of "Complexity" in physics? Is it quantifiable?

I don't know much about the discipline of "Complex systems studies" but I know in the field of "Statistical mechanics" there is much talk about the "Complexity of the system"....

Asked on 08/30/2021 by Hamed Begloo

3 answer

Conservation of Distinctions in Quantum Mechanics

Recently I have been reading Quantum Mechanics The Theoretical Minimum by Leonard Susskind. In the book he mentions the law of conservation of distinctions, i.e. the conservation of information. He...

Asked on 08/30/2021 by SK Dash

1 answer

How to derive the formula for heat produced due to electricity correctly from Joule's laws for heating?

From Joule's laws, we get this: $$Hpropto I^{2}Rt$$$$implies H = KI^{2}Rt ...(i)$$ Now, we have to find/define the value of K. According to my...

Asked on 08/30/2021

2 answer

How can the angular velocity vector be obtained from angular displacement which is not a vector?

My physics book (The Fundamentals of Physics) while explaining vector-ness of angular quantity (formally "Are Angular Quantities Vectors?") states that angular velocity and angular acceleration are vectors....

Asked on 08/30/2021 by user249968

6 answer

Unitarity implies branch cuts in $s > 4m^2$ in the $S$-matrix

Why does unitarity imply a branch cut in the $S$-matrix after $s > 4m^2$ where $s$ is the Mandlestam variable and $m$ is the mass of...

Asked on 08/30/2021

1 answer

Quantization of complex scalar field

I'm learning Peskin's qft now and I'm a little confused about problem 2.2 . Suppose I write the field $phi(x)$ as: $phi(x) =int frac{d^3p}{(2pi)^3}frac{1}{sqrt{2E_{p}}} (a_{p}e^{-ipx}+b_{p}e^{ipx})$ I know...

Asked on 08/30/2021 by ZHC

2 answer

Do the time taken to travel a fixed distance changes in two different inertial frame of reference in relative motion

I have calculated time taken to travel a fixed distance by the object from two different frames of refrence. One frame was moving with uniform velocity wrt other ....

Asked on 08/30/2021 by Prabhat

2 answer

If light could bend around a person ,would that make the person invisible?

If we place an object such as a coin in front of the light source ,e.g a candle we cant see the candle through the coin but if the size...

Asked on 08/30/2021 by M. S. L

1 answer

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